I recently had a Purple Heart shaft made for my break cue, the shaft has a G-10 ferrule/tip. In the few weeks using it, I have found it to be very unforgiving, You must be spot on center ball, hitting the 1 ball solid to get the best results. I have considered having the tip flattened out and putting a Taom on. That is what I used prior to the new shaft. My jump cue is a Hanshew, Purple Heart shaft with a black 1 piece ferrule/tip, it makes jumping quite a bit easier than my old bunjee. After a discussion with one of the worlds best at jumping, I have huge understanding now of how angle, leverage (length of cue) and stroke effects the jump and cue ball control.